Renesas RL78/G1P Hardware User Manual page 461

RL78/G1P
(4) Processing flow (in continuous transmission mode)
Figure 11-106. Timing Chart of UART Transmission (in Continuous Transmission Mode)
<1>
SSmn
STmn
SEmn
SDRmn
Transmit data 1
TxDq pin
ST
Shift register mn
INTSTq
MDmn0
TSFmn
BFFmn
<2> <3>
Note
Note If transmit data is written to the SDRmn register while the BFFmn bit of serial status register mn (SSRmn) is
1 (valid data is stored in serial data register mn (SDRmn)), the transmit data is overwritten.
Caution The MDmn0 bit of serial mode register mn (SSRmn) can be rewritten even during operation.
However, rewrite it before transfer of the last bit is started, so that it will be rewritten before the
transfer end interrupt of the last transmit data.
Remark m: Unit number (m = 0), n: Channel number (n = 0), q: UART number (q = 0), mn = 00
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
Transmit data 2
Transmit data 1
P SP ST
Shift operation
Data transmission
<2> <3>
CHAPTER 11 SERIAL ARRAY UNIT
Transmit data 3
Transmit data 2
P SP ST
Shift operation
Data transmission
<2> <3>
<6>
Transmit data 3 P SP
Shift operation
Data transmission
<4>
<5>
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